You are a Space Marshall and you have been sent to the colony on Delta 5-5 to investigate a distress call.
On approach to the planet you ship comes into contact with a gravity well and you are forced to crash land on Delta 5-5. Having survived the crash you discover that your ship has been drained of power and can only run on minimal power. That means your stuck on Delta 5-5.
Put on your Power Armour, navigate the planets surface to reach the colony. There you must discover what happened to the colonists and find a way of restoring your ship to full power.